finish rsa implementation

src/utils.js

@@ -1,13 +1,40 @@
 'use strict'
 
 const multihashing = require('multihashing')
+const path = require('path')
+const fs = require('fs')
 
-// Check the equality of two keys
-exports.keyEqual = (k1, k2) => {
-  return k1.buffer.equals(k2.buffer)
-}
+const URL = global.window && (window.URL || window.webkitURL)
 
 // Hashes a key
-exports.keyHash = (key) => {
-  return multihashing(key.buffer, 'sha2-256')
+exports.keyHash = (bytes) => {
+  return multihashing(bytes, 'sha2-256')
 }
+
+const toBlob = (content) => {
+  try {
+    let blob
+    try {
+      // BlobBuilder = Deprecated, but widely implemented
+      const BlobBuilder = global.window &&
+              (window.BlobBuilder ||
+              window.WebKitBlobBuilder ||
+              window.MozBlobBuilder ||
+              window.MSBlobBuilder)
+
+      blob = new BlobBuilder()
+      blob.append(content)
+      blob = blob.getBlob()
+    } catch (e) {
+      // The proposed API
+      blob = new window.Blob([content])
+    }
+    return URL.createObjectURL(blob)
+  } catch (e) {
+    return 'data:application/javascript,' + encodeURIComponent(content)
+  }
+}
+
+const rawScript = fs.readFileSync(path.join(__dirname, '../vendor/prime.worker.js'))
+
+exports.workerScript = toBlob(rawScript.toString())